Benthic macroinvertebrate community in the Sinos river drainage basin, Rio Grande do Sul, Brazil

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  http://dx.doi.org/10.1590/1519-6984.04815 Original Article

  

Benthic macroinvertebrate community in the Sinos river

drainage basin, Rio Grande do Sul, Brazil

a a b

  M. P. Barros *, L. M. Gayeski and J. G. Tundisi a

  

Zoology Laboratory, School of Health Sciences, Universidade Feevale – Feevale, Campus II,

RS-239, 2755, CEP 93352-000, Novo Hamburgo, RS, Brazil

b

  

Instituto Internacional de Ecologia – IIE, Rua Bento Carlos, 750, CEP 13560-660, São Carlos, SP, Brazil

  • *e-mail: barrospm@cpovo.net

    Received: March 3, 2015 – Accepted: April 16, 2015 – Distributed: August 31, 2016

  (With 5 figures)

  Abstract

  Aquatic macroinvertebrate fauna is a relevant component of limnic continental aquatic ecosystems, playing an important role in several processes with relevant biocomplexity. The present study characterized the benthic macroinvertebrate fauna found in three hydric bodies in the Sinos river drainage basin regarding community structure. Sample was collected from January to December 2013 in three locations in the basin: the city of Caraá (29 °45’45.5”S/50°19’37.3”W), the city of Rolante (29°38’34.4”S/50°32’33.2”W) and the city of Igrejinha (29°36’10.84”S/50°48’49.3”W). Abiotic components (pH, dissolved oxygen and temperature) were registered and collected samples were identified up to family type. Average annual pH, dissolved oxygen and temperature were similar in all locations. A total of 26,170 samples were collected. Class Insecta (Arthropods) represented 85.5% of total sample. Platyhelmintes, Mollusca and Annelida samples were also registered. A total of 57 families were identified for the drainage basin and estimators (Chao-1, Chao-2 and jackknife 2) estimated richness varying from 60 to 72 families.

  Keywords: aquatic invertebrates, community structure, diversity indices.

  

A comunidade de macroinvertebrados bentônicos da bacia hidrográfica

do rio dos Sinos, Rio Grande do Sul, Brasil

Resumo

  A fauna de macroinvertebrados aquáticos é um relevante componente dos ecossistemas aquáticos límnicos continentais, atuando em vários processos de importante biocomplexidade. O presente estudo caracterizou a fauna de macroinvertebrados bentônicos em três corpos hídricos da Bacia Hidrográfica do Rio dos Sinos, em relação a estrutura da comunidade. Amostragens foram realizadas de janeiro a dezembro de 2013 em três locais na bacia: Município de Caraá (29°45’45,5”S/50°19’37,3”W), Município de Rolante (29°38’34,4”S/50°32’33,2”W) e Município de Igrejinha (29°36’10,84”S/50°48’49,3”W). Variáveis abióticas (pH, oxigênio dissolvido e temperatura) foram registradas e os exemplares coletados identificados até família. As médias anuais de pH, oxigênio dissolvido e temperatura foram similares em todos os pontos. Um total de 26.170 exemplares foi amostrado. A Classe Insecta (Arthropoda) representou 85,5% do total. Platyhelmintes, Mollusca e Annelida também foram registrados. Foram determinadas 57 famílias para a bacia hidrográfica e os estimadores (Chao-1, Chao-2 e jackknife 2) projetaram uma riqueza variando de 60 a 72.

  Palavras-chave: invertebrados aquáticos, estrutura da comunidade, índices de diversidade.

1. Introduction

  Conservation of biodiversity in general and specifically Invertebrates are of major ecologic importance in aquatic biodiversity is fundamental to maintain biosphere freshwater environments; they play a decisive role in organic processes and to keep the course of the evolution of natural matter fragmentation and decomposition and are important systems, however, in many tropical regions, studies on elements in food chains and food webs. They are directly biodiversity are still at an intermediate stage and not very involved in energy flow and perform an effective role in advanced in knowledge, especially in regions with internal biogeochemical cycles. Their abundance and diversity deltas of large rivers in South America, which are active are associated to different factors, such as trophic level of centers of evolution due to their biodiversity and gene aquatic systems, pollution and contamination levels, habitat availability and disturbance frequency (Ismael et al., 1999 flow interaction (Tundisi and Matsumura-Tundisi, 2003).

  ).

  

Aquatic macroinvertebrate at the Sinos River basin, RS, Brazil

  ), in the major water bodies: upper Sinos river, Rolante river and Paranhana river, always in superficial waters of the water body itself.

  Fundação SOS

  . The river currents are strong at sampling site and the bottom is made up of a sandy and rocky (pebbles) substrate, with various sizes intermingled with decomposing organic matter made up mainly of tree leaves from riparian vegetation located upstream. A greater environmental heterogeneity is found at this point with the decomposition of the sandy substrate. The city presents an area of 13557 hectares of which 22% are still originally covered by the Atlantic forest (

  2

  P3 – Site 3 - (29°36’10.84”S/50°48’49.3”W). City of Igrejinha. Established in the “Casa da Pedra” district, sampling site is located in the Paranhana river, five kilometers downstream of city center (urban density) and 15 kilometers from the mouth of the Sinos river, which is located in the rural area of the city of Taquara, the river drains an area of 580 km

  ), and a estimated population of 20479 inhabitants in 2013 (IBGE, 2010 ). Sampling point is under the impact of large urban conglomerates located upstream, such as the cities of Riozinho and São Francisco de Paula.

  Fundação SOS Mata Atlântica, 2014

  . Sampling point is located 22 km from the mouth of the Sinos river, which is located in the rural area of the city of Taquara. The river currents are strong at sampling site and the bottom is made up of a sandy and rocky (pebbles) substrate, with various sizes intermingled with decomposing organic matter made up mainly of tree leaves from riparian vegetation located upstream. A greater environmental heterogeneity is found at this point with the decomposition of the sandy substrate. The city presents an area of 29675 hectares of which 17% are still originally covered by the Atlantic forest (

  2

  P2 – Site 2 - (29°38’34.4”S/50°32’33.2”W). City of Rolante. Established in a location best known as “Reichert”, sampling point is located in the Rolante River, five kilometers upstream of city center (urban density) and receives contributions from rivers Riozinho and Mascarada, the river drains an area of 500 km

  ). Sampling point does not suffer the impact of great urban conglomerates located on upstream, thus the anthropic impact is considered low.

  SOS Mata Atlântica, 2014 ), and a estimated population of 7742 inhabitants (IBGE, 2010

  The city presents an area of 29538 hectares of which 23% are still originally covered by the Atlantic forest ( Fundação

  P1 – Site 1 - (29°45’45.5”S/50°19’37.3”W). City of Caraá. Established in Lageadinho, this sampling site is located in the beginning of the formation of the Sinos river, although it is not characterized as the source of the river, as it already presents the influence of some small contributors. At this location, there are strong currents and whenever compared to the other two sites the bottom is made up of a rocky substrate, pebbles with various sizes intermingled with little decomposing organic matter.

  In order to determine physical and chemical characteristics, benthic macroinvertebrate and water samples were collected in three different sites along the drainage basin (Figure 1

  According to Silveira and Queiroz (2006), benthic macroinvertebrates are a group of animals visible to the naked eye, made up mainly by mollusks, crustaceans and insects that inhabit the substrate at the bottom of rivers.

  ). There is few available data on the structure of the benthic macroinvertebrate community along the drainage basins in the state of Rio Grande do Sul, highlight is given to studies by

  They are important in limnic environments, serving as food for fish and taking part in the energy flow and nutrient cycling (Ayres-Peres et al., 2006

  ). As they reflect changes in the environment, they are recommended as bioindicators of water quality (Bueno et al., 2003

  ), representing an important tool to understand the functioning and structure of lotic ecosystems (Galdean et al., 2001 ).

  According to Franz et al. (2010), the Sinos river basin is among the most populated in the state of Rio Grande do Sul and represent a history marked by European colonization which took place from the 19th century until the 1940’s.

  Occupation of lowlands and hillsides caused changes in the characteristics of natural areas. Forests were replaced by rural areas, and later by urban intensification. The impact of human activity, mainly the pollution of water with domestic sewage without treatment, add up along the river, and high levels of fecal coliform reflect the great sanitation deficit in the drainage basin, especially along the middle and lower courses of the Sinos river (Blume et al., 2010

  Bueno et al. (2003), Stenert et al. (2004), Volkmer-Ribeiro et al., (2004), Ayres-Peres et al. (2006), Piedras et al. (2006), Buckup et al. (2007), Milesi et al.

  2.2. Sampling sites

  (2009) and Biasi et al. (2010). The following studies are highlighted for the drainage basin of the Sinos river: Mansur and Pereira (2006), Strieder et al. (2006), Bieger et al. (2010) and

  Maltchik et al. (2010). The objective of the present study is to characterize the benthic macroinvertebrate fauna found in three water bodies located in the Sinos river drainage basin regarding community structure.

2. Material and Methods

2.1. Study area

  The Sinos river drainage basin is located in the northeastern region of the state of Rio Grande do Sul, Brazil (29°20’ - 30°10’S/50°15’ - 51°20’ W), and covers two geomorphic provinces: the Southern Plateau and the Central Depression. It is part of the Guaíba drainage basin and presents an area of approximately 800 km

  2

  , including 32 cities (FEPAM, 2014 ). The Sinos river drainage basin provides water to about 1.3 million people, with a population density of approximately 300 people per square kilometer, some urban areas and densely populated and area located along the lower course of the river. The region presents diversified industrial production: footwear and leather, mechanics and metallurgy, tourism and hospitality, where the lower portions of the drainage basin are under strong anthropic pressure due to the growth of the largest industrial park in the state (Blume et al., 2010

  ).

  

Barros, M.P., Gayeski, L.M. and Tundisi, J.G.

  ). Unweighted Pair Group Method with Arithmetic Mean (UPGMA) was used, the result is represented by a dendrogram. This analysis was carried out by software PAST - Version 2.16. (Hammer et al., 2001). Non-parametric richness estimators: Chao-1, Chao-2 and second order

  Location of the sampling sites (P1, P2 and P3), in the study area of the Sinos River basin, Southern Brazil, Rio Grande do Sul.

  Figure 1.

  ) small fishing net with a 2mm mesh size. Stream sampling method (kick-sampling) was used, which is a method that consists in moving pebbles at the bottom of the river with the objective of carrying dislocated animals into the net. All collected organisms were fixed on site using 70% ethanol and were stored in plastic buckets. Once in the laboratory, the material was screened and the samples were indentified up to family type by using bibliography according to each taxonomic group (Lopretto and Tell, 1995; Merrit and Cummins, 1996; Moretti, 2004; Salles et al., 2004; Benetti et al., 2006; Mansur and Pereira, 2006; Costa et al., 2006; Froehlich, 2007; Mugnai et al., 2010; Carter et al., 2011 ).

  2

  Macroinvertebrate and water sampling to determine physical and chemical characteristics took place from January to December 2013. A 60cm × 40cm (2400 cm

  jackknife present better performance.

  revised these estimator and concluded that Chao-2 and second order

  jackknife, Colwell and Coddington (1994)

  M

  Mata Atlântica, 2014 ), and an estimated population of 33711 inhabitants in 2013 (IBGE, 2010

  Similarity Index (S

  (Hammer et al., 2001 ) were used for statistical analysis and biotic index calculations. Student’s t-test was used to compare H value (Shannon Diversity Index) between the points. Group method was considered to calculate Morisita

  BIOESTAT 5.0 (Ayres et al., 2007 ) and PAST

  ). Water temperature and pH were recorded in the field by using pHmetro Hanna Instruments (HI 98128).

  Measurement of dissolved oxygen was conducted by the Analytic Department at FEEVALE University, a FEPAM-RS certified laboratory. Sample collection, as well as all measurements, was carried out according to the Standard Methods for Examination of Water and Wastewater, 22nd Ed (Rice et al., 2012

  /s for this transposition. Sampling point is partially under the impact of large urban conglomerates located upstream, such as the cities of Três Coroas, Gramado, Canela and São Francisco de Paula.

  3

  ), thus, the water from the Caí river flows through this site in an inconstant and variable manner with maximum water flow of up to 11.6 m

  ). At this point, the Salto Dam System is important for the water dynamics of the river, since the dam system enables the regularization and transposition of water from the Caí river basin to the Sinos river basin for the production of electricity since 1956 through the Paranhana river (Macedo, 2010

2.3. Macroinvertebrate sampling

  

Aquatic macroinvertebrate at the Sinos River basin, RS, Brazil

  aquatic ecosystem, still, he considers the phenomena that

3. Results and Discussion

  with temperature rise there is a decrease in solubility of

3.1. Physical and chemical characteristics

  the oxygen found in the water and an increase of intensity The three sampling sites are similar regarding limnologic for most biological processes, which means a higher characteristics of zonation, such as high current speed and consumption of oxygen. substrate made up of fixed rocks, stones, gravel and thin

  Statistically significant differences were not found among sand, with deposition of mud and allochtonous leaves in the annual averages for all three sites in regards to the following small puddles or protected areas. Sampling sites can be characteristics: temperature (ANOVA: F : 1.28 ≤ F 3.44);

  calc crit

  traditionally classified as rhithron, although they do not present great slopes. Another important characteristic of the sampling points is the transparency of the water, with little suspended material that could be visually identified during sampling . Sites are located in erosion areas, which is caused by the pluviometric regime and not by sediment deposition.

  In regards to temperature variation, Hawkes (1975) characterizes a ritral zone with an annual temperature variation that does not go over 20 °C, temperature varied less in the three sampling sites: Site 1 (8.1 up to 22.7 °C; µ=17.7 °C), Ponto 2 (9.0 up to 24.6 °C; µ=19.0 °C) e Ponto 3 (9.0 up to 25.6 °C; µ=21.2 °C). Site 1 presents the smallest observed amplitude, followed by Sites 2 and 3 (Figure 2

  ), in regards to average annual temperature the

  Figure 2. Variation in temperature of water the

  same behavior occurred, with the average increasing Sinos River – RS. Southern Brazil, Rio Grande do Sul. towards the mouth of the basin. This classification based (January-December 2013). in thermal balance could cover stretches such as mountain rivers, but the sites are already located in areas that present a decrease in laminar flow.

  Regarding pH, annual average, calculated over 12 months, presented neutral values (Site 1 – 7.04, Site 2 – 7.08 and Site 3 – 6.85). These values are expected in continental natural waters and are among the variation predicted by CONAMA resolution No. 357/205 (Brasil, 2005

  ) for class 1 waters. Extreme recorded pH values were 6.17 at Site 3 (the lowest) and 7.69 (the highest) at Site 1 (Figure 3). Most species of aquatic organisms are very sensitive to pH variations and very acidic or alkaline waters may be harmful to aquatic communities, therefore, the recorded pH variation is not a compromising factor for the maintenance

  Figure 3.

  Variation in pH of water the Sinos

  of aquatic life in the sites that were studied. According to River – RS. Southern Brazil, Rio Grande do Sul. Esteves (1998), most continental water bodies have a pH (January-December 2013). that varies between 6 and 8.

  In regards to dissolved oxygen (DO), the annual average presented high values in all of the monitored

  • –1 –1

  sites: Site 1 – 8.71mgO2L , Site 2 – 8.94 mgO2L and

  • –1

  Site 3 – 8.42mgO2L . The smalled recorded value was

  • –1

  7.3mgO2L , in the month of December at Site 3, and the

  • –1 highest was 10,85mgO2L , in the month of July at Site 2.

  These are expected values for natural waters, being above values predicted by CONAMA resolution No. 357/205 (Brasil, 2005

  ) for class 1 waters, not constituting a compromising factor for the maintenance of aquatic biota at the studied sites. It is important to observe the inverse relationship between high values of dissolved oxygen at all three sites (Figure 4

  ) in the month of July 2013, with the lower temperatures (Figure 2 ) recorded during the same Figure 4.

  Variation in Dissolved Oxygen (mg/L) of water month.

  Schäfer (1985) notes that oxygen balance must be the Sinos River – RS. Southern Brazil, Rio Grande do Sul. understood as the most important factor in assessing an (January-December 2013).

  

Barros, M.P., Gayeski, L.M. and Tundisi, J.G.

  High abundance of specimens at Sites 2 and 3 may Ph (ANOVA F : 2,437 ≤ F 3.44) and dissolved oxygen

  calc crit

  calc crit

  be explained by the great quantity of allochthonus leaf (ANOVA: F : 0.7958 ≤ F 3.44; α: 0.05).

  material deposited among the pebbles in the river bottom,

3.2. Biodiversity, community structure and composition

  from the riparian vegetation located upstream. According to A total of 26,170 samples, including immature individuals, Bueno at al. (2003) the leaf material serves as food and shelter for maggots of many types of insects, as well as were collected during sampling period. From the total, support for adult individuals during periods of drought. 5647 specimens were sampled at Site 1 (Lageadinho,Caraá),

  Greater substrate heterogeneity with the occurance of sand 10444 were sampled at Site 2 (Reichert, Rolante) and deposits in both sites may also be positively influencing 10079 were sampled at Site 3 (Casa de Pedra, Igrejinha). the abundance of benthic macroinvertebrate species. This number is closed to the value found by Buckup et al.

  A total of 57 benthic macroinvertebrate families were (2007), who collected 28694 specimens during samplings recorded for this water basin, 51 families for Site 1, 42 for in three rivers from the Pelotas river basin, state of Rio

  Site 2 and 35 families for Site 3 (Table 1 ). Classic diversity

  Grande do Sul, which can be characterized as Southern indices (Table 2 ) were established for all three sites, with Brazilian mountain rivers. the Shannon diversity index (H) being the highest (2,494)

  

Table 1. Taxonomic groups and absolute frequencies of benthic invertebrates by families found in each sampling

site in the Sinos River basin between January and December 2013. P1 – (29°45’45.5”S/50°19’37.3”W) City of Caraá,

P2 – (29°38’34.4”S/ 50°32’33.2”W) City of Rolante, P3 – (29°36’10.84”S/50°48’49.3”W) City of Igrejinha.

  Filo/Class Order Family P1 P2 P3

  Platyhelmintes Tricladida Dugesiidae 8 277 Mollusca/ Gastropoda Cochliopidae

  58

  9

  3 Mollusca/ Gastropoda Ampullaridae

  10

  21 Mollusca/ Gastropoda Planorbiidae

  1 Mollusca/ Gastropoda Lithogliphidae 2,965

  37 Mollusca/Bivalvia Cyrenidae 3 105 199 Mollusca/Bivalvia Hyriidae

  1 Annellida/Oligochaeta

  19

  10

  13 Tubificidae Annelida/Hirudinea Glossiphonidae

  2 Arthropoda/Chelicerata Acarina “Hydracarina”

  12

  1 Arthropoda/Crustacea Isopoda Cymothoidae

  6 Arthropoda/Crustacea Decapoda Palaemonidae

  8 Arthropoda/Crustacea Decapoda Trichodatylidae

  20 Arthropoda/Insecta Hemiptera Naucoridae 104 216 158 Arthropoda/Insecta Hemiptera

  82

  37

  2 Veliidae Arthropoda/Insecta Hemiptera Gerridae

  1 Arthropoda/Insecta Hemiptera Pleidae

  1 Arthropoda/Insecta Hemiptera Mesoveliidae

  1 Arthropoda/Insecta Hemiptera Belostomatidae

  1 Arthropoda/Insecta Coleoptera Elmidae 337 637 150 Arthropoda/Insecta Coleoptera Psephenidae 69 752

  6 Arthropoda/Insecta Coleoptera Gyrinidae

  25

  4 Arthropoda/Insecta Coleoptera Staphilinidae

  7

  30

  5 Arthropoda/Insecta Coleoptera Dytiscidae

  3 Arthropoda/Insecta Coleoptera Curculionidae

  1

  1 Arthropoda/Insecta Coleoptera Hydrophilidae

  17

  2 Arthropoda/Insecta Coleoptera Dryopidae

  4 Arthropoda/Insecta Coleoptera Lutrochidae

  40

  52 Arthropoda/Insecta Diptera Chironomidae 1,239 1,967 497 Arthropoda/Insecta Diptera Tipulidae

  9

  29

  69 Arthropoda/Insecta Diptera Simulidae 241 293

  71 Arthropoda/Insecta Diptera Empididae

  2

  2 Arthropoda/Insecta Plecoptera Perlidae 67 167

  3

  

Aquatic macroinvertebrate at the Sinos River basin, RS, Brazil

Table 1. Continued...

  Filo/Class Order Family P1 P2 P3

  Arthropoda/Insecta Plecoptera Gripopterygidae

  16

  9 Arthropoda/Insecta Megaloptera Corydalidae

  34 47 113 Arthropoda/Insecta Trichoptera Philopotamidae 65 115

  22 Arthropoda/Insecta Trichoptera Hydropsychidae 826 994 3,751 Arthropoda/Insecta Trichoptera Hydroptilidae

  12

  1

  1 Arthropoda/Insecta Trichoptera Leptoceridae 49 152

  32 Arthropoda/Insecta Trichoptera Glossosomatidae 14 293 398 Arthropoda/Insecta Trichoptera Polycentropodidae

  6

  13

  1 Arthropoda/Insecta Trichoptera Calamoceratidae

  21 Arthropoda/Insecta Trichoptera Odontoceridae

  6

  21

  30 Arthropoda/Insecta Trichoptera Hydrobiosidae

  13

  3 Arthropoda/Insecta Trichoptera Helichopsichidae

  3

  13

  1 Arthropoda/Insecta Trichoptera Sericostomatidae

  2 Arthropoda/Insecta Odonata Gomphidae 13 143

  24 Arthropoda/Insecta Odonata Corduliidae

  2

  8

  4 Arthropoda/Insecta Odonata Coenagrionidae 128

  40

  2 Arthropoda/Insecta Odonata Megapodagrionidae

  4 Arthropoda/Insecta Odonata Calopterygidae

  18

  1

  1 Arthropoda/Insecta Odonata Libellulidae

  1

  2

  14 Arthropoda/Insecta Ephemeroptera Leptohyphidae 967 291 629 Arthropoda/Insecta Ephemeroptera Baetidae 452 290 340 Arthropoda/Insecta Ephemeroptera Leptophlebiidae 618 691 3.000 Arthropoda/Insecta Ephemeroptera Caenidae

  3 Arthropoda/Insecta Lepidoptera Pyralidae

  38 9 171 TOTAL/individuals/site

  5,647 10,444 10,079 TOTAL/individuals

  26,170 TOTAL/family 57 families

  51

  42

  35 Table 2. Diversity index of benthic invertebrate communities, calculated over samples collected in 2013. For all three sites,

  

N: represents the total number and sampled specimens; S: represents the richness of the families; H’: represents Shannon

Index; D : represents Margalef Index; Chao-1: represents a richness predictor and E’: represents an evenness index. Mg

Locais N S H’ D Chao-1 (E’)

  Mg

  Site 1 5,647 51 2,494 5,788 54 0,6344 Site 2 10,444 42 2,416 4,431 45 0,6465 Site 3 10,079 35 1,939 3,688 37 0,5454 when compairing H’ between Sites 1 and 2; 1 and 3; and 2 and Margalef Index also for Site 1 (5,7880). The index difference found may be explained by the conditions of and 3 (tcalc: 3.86; gl: 11,400; tcalc: 26.39; gl: 12,515; their calculations, as Shannon places value on species tcalc: 26.89; gl: 20,154; α: 0.05). proportional abundance placing emphasis on richness

  Shannon Diversity Index (H’) varied from 1,939 (Site and homogeneity, besides rare species, and the Margalef 3) to 2,494 (Site 1), which are values close to the ones

  Index expresses richness weighed by sample size; however, found by Bueno et al. (2003) in small streams in the cities both indices indicate Site 1 as the site with the greatest of Taquara and São Francisco de Paula, where H’ varied diversity. Although this site also presented less abundance from 1,000 to 3,580.

  Richness estimator Chao-1 calculated the possible in specimens (5647), the highest family absolute richness number of families for each site (Site 1 – 54, Site 2 – 45 and

  (51) was found here. The values may indicate an increase in degradation of the environmental quality of the basin Site 3 – 37), where estimated basin value was 60 families, from upstream to downstream sites, where there is a close to the 57 families recorded by this study. Stenert et synergic effect from the increase of anthropic impact on al,m (2004) recorded 84 macroinvertebrate families in an the waters of the ecosystem. Student’s t test revealed that extensive study conducted in 146 humid areas distributed along the state, therefore, so far, families found at the Sinos there was no significant different between sampling sites

  

Barros, M.P., Gayeski, L.M. and Tundisi, J.G.

  Rosenberg and Resh (1993), insects are dominant in continental water communities, being their great capacity of inhabiting and keeping high diversity in most water ecosystems one of the most surprising aspects of their biology. Among their abilities, special mention is made to their capacity to burry themselves in the substrate (sand, pebbles and leaves deposited at the bottom of the river) or to crawl in interstitial spaces, besides their respiratory adaptations which facilitate recolonization of different micro-habitats after catastrophic events such as floods (Kikuchi and Uieda, 1998; Buss et al., 2002 ).

  Figure 5. Dendrogram obtained by Morisita Index (UPGMA) representing the family similarity among sampling sites. Sinos River – RS. Southern Brazil, Rio Grande do Sul. (January-December 2013). Correlation Coefficient: rc = 0.3117.

  Benthic macroinvertebrate species are differentially sensitive to many biotic and abiotic factors in their environment. Consequently, macroinvertebrate community structure has commonly been used as an indicator of the condition of an aquatic system. A total of 26,170 specimens were collected. A total of 57 families were identified for the drainage basin and estimators (Chao-1, Chao-2 and jackknife 2) estimated richness varying from 60 to 72 families. In the sampling sites, the community structure is typical of temperate rivers, despite having serious environmental impacts, the Basin of the Sinos River still has a high biodiversity and abundance of individuals.

  73 taxa (57 + 16). This value can be considered high for the area, considering sampling sites are quite distinct from one another. In this context, it is possible to predict that the richness of invertebrate families found in the Sinos River basin can be elevated by using different sampling methods in areas which have yet to be explored.

  adding the families found by Bieger at al. (2010) which were not found in this study (16), we come to a total of

  jackknife 2 predicted 72 families, however, when

  River basin is frequently reffered to as largely degraded; a series of impacts on the quality of the water, soil and air have been reported for this area over the last years. In the present study, this community was characterized by monitoring water macroinvertebrates, and it theoretically reflects the environmental conditions. For the basin, 57 families were found and predictor Chao-1 estimated 60 as an expected amount, Chao-2 estimated 64 families and

  According to Spilki and Tundisi (2010), the Sinos

  From the total collected specimens, the Insecta Class represents 85.5% of the total amount. According to

  River basin represent 68% of the total amount registered for the state of Rio Grande do Sul.

  When added, these four families (n = 16,585) represent 63.4% of total sample size, with Arthropoda/Insecta at the top 3. Arthropodes totaled 22,429 specimens (85.7%) among the four phylum registered in the samples (Platyhelmintes, Mollusca, Annelida and Arthropoda) constituting the dominant macroinvertebrates in the basin.

  Some families were abundant in the samples, such as Hydropsychidae (n = 5,571), Leptophlebiidae (n = 4,309), Chironomidae (n = 3,703) and Lithogliphidae (n = 3,002).

  Equability (E’), also known as Pielou Evenness Index (J), was calculated for all three sites (Table 2), with maximum value found at Site 2 (0,06465) in an interval from 0 > E ≥ 1; for this index, values close to one (1) show little monospecific dominance, which means that theoretically this environment is more diverse.

  ), separated sites in two distinctive groups, revealing greater similarity between Sites 1 and 2.

  M

  ), found according to the Morisita Similatiry Index (S

  Most registered families (n = 30) were found at all three sampling sites along the Sinos River basin, with some singularities: Planorbiidae and Hyriidae (Mollusca) and Gerridae, Pleidae, Mesoveliidae and Belostomatidae (Arthropoda/Insecta) were found with only one specimen each, thus being considered rare in the samples collected. Sample collection method was probably not efficient for species of these families, as they are commonly found in continental freshwaters. The similarity dendrogram (Figure 5

  Bieger et al. (2010), registered 54 macroinvertebrate families in small streams in the Sinos River basin. For these 54 families, the following were not registered in this study: Mycetopodidae and Sphaeridae (Bivalvia/Mollusca) and Lymnaeidae and Physidae (Gastropoda/Mollusca); Dogielinotidae (Arthropoda/Crustacea/Amphipoda) and Aeglidae (Arthropoda/Crustacea/Decapoda); Aeshnidae (Arthropoda/Insecta/Odonata); Noteridae (Arthropoda/ Insecta/Coleoptera); Euthyplocidae (Arthropoda/Insecta/ Ephemeroptera); Nepidae, Hydrometridae, Gelastocoridae and Corixidae (Arthropoda/Insecta/Hemiptera); Dixidae, Ceratopogonidae and Blephaceridae (Arthropoda/Insecta/ Diptera).

4. Conclusion

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